ID. NO.
ISSUE
1
SHEET
1 of 40
DOC.NO.
BN-DS-E2
Electrical Design Standard
Symbols
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Typology: Summaries
2022/2023
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ID. NO. ISSUE SHEET 1 of 40
DOC.NO.
Electrical Design Standard
Symbols
ID. NO. ISSUE SHEET 2 of 40
DOC.NO.
DOCUMENT
NUMBERS
INDEX SYMBOLS PAGE
501-502 KEY DIAGRAMS, M. V. AND L. V.
ONE LINE DIAGRAMS
503 CONTROL AND WIRING DIAGRAMS 17 - 28
506 COMMUNICATION SYSTEMS 29
510 POWER LAY-OUTS 30 - 38
520 LIGHTING LAY-OUTS 30 - 38
530 EARTHING LAY-OUTS 30 - 38
550 CATHODIC PROTECTION 30 - 38
LOGIC SYMBOLS 39 - 40
ID. NO. ISSUE SHEET 4 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
07-13-02 CONTACTOR
07-13-05 CIRCUIT BRACHER
07-13-02 DISCONNECTOR (ISOLATOR)
OFF LOAD
07-13-08 SWITCH-DISCONNECTOR
ON LOAD
07-21-08 FUSE-DISCONNECTOE
OFF LOAD
07-21-09 FUSE SWITCH-DISCONNECTOR
ON LOAD
07-14-04 VOLTAGE INDICATOR
CAPACITIVE
ID. NO. ISSUE SHEET 5 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
NEN-B-45A SINGLE-POLE SWITCH
NEN-B-45B TWO-POLE SWITCH
NEN-B-45C THREE-POLE SWITCH
NEN-B-45D TWO-POLE SWITCH WITH SWITCHED
NEUTRAL CONDUCTOR
NEN-B-45F FOUR-POLE SWITCH WITH SWITCHED
NEUTRAL CONDUCTOR
ID. NO. ISSUE SHEET 7 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
02-13-15 OPERATED BY ROLLER
02-13-16 OPERATED BY CAM
02-13-20 OPERATED BY SPRING
W
OPERATED BY PNEUMATIC
OR HYDRAULIC CONTROL,
SINGLE ACTING
OPERATED BY PNEUMATIC
OR HYDRAULIC CONTROL,
DOUBLE ACTING
02-13-23 OPERATED BY ELECTROMAGNETIC
ACTUATOR
02-13-26 OPERATED BY ELECTRIC MOTOR
M
02-13-27 OPERATED BY ELECTRIC CLOCK
02-14-01 CONTROL BY FLUID LEVEL
02-14-03 CONTROL BY FLOW
NEN-J-92 OPERATED BY PEDAL
NOTE: ONLY ACTION IS DESCRIPTED AND A SWITCH IS
SHOWN FOR CLARIFICATION.
SYMBOL CAN ALSO BE USED FOR CIRCUIT
BREACKERS, ISOLATORS A.S.O.
ID. NO. ISSUE SHEET 8 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
NEN-J-98 OPERATED BY CENTRIFUGAL FORCE
NEN-J-102 OPERATED BY BIMETAL
NS-01 HAND RESET
07-09-01B TEMPERATURE SENSITIVE SWITCH
NEN-J-61 MAGNETIC OVERCURRENT
PROTECTION
NEN-J-62 THERMAL OVERCURRENT
PROTECTION
NEN-J-61-62 THERMAL AND MAGNETIC
OVERCURRENT PROTECTION
NEN-J-74 GROUNDFAULT PROTECTION
NEN-J-76 UNDER VOLTAGE PROTECTION
02-12-07 AUTOMATIC RETURN (THE TRIANGLE IS
POINTED IN THE RETURN DIRECTION)
02-12-11 MECHANICAL INTERLOCK
BETWEEN TWO DEVICES
02-12-12 LATCHING DEVICE
NOTE: ONLY ACTION IS DESCRIPTED AND A SWITCH IS
SHOWN FOR CLARIFICATION.
SYMBOL CAN ALSO BE USED FOR CIRCUIT
BREACKERS, ISOLATORS A.S.O.
ID. NO. ISSUE SHEET 10 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
07-17-04B INSTANTANEOUS OVERCURRENT I >>
07-17-04 OVERCURRENT (^) II >
07-17-03 UNDERPOWER (^) IP<
NEN-K-13 REVERSE POWER (^) P
NEN-K-21 MINIMUM IMPEDANCE (^) Z<
07-17-13 LOCKED ROTOR (^) n O
NEN-K-17 TIME (^) t
07-09-01 TEMPERATURE
ID. NO. ISSUE SHEET 11 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
06-09-01 TRANSFORMER WITH TWO WINDINGS
06-10-05 VARIABLE VOLTAGE TRANSFORMER
06-09-06 AUTO-TRANSFORMER
06-09-08 CHOKE / REACTOR
06-09-01B VOLTAGE TRANSFORMER
06-09-10 CURRENT TRANSFORMER
06-13-04 CURRENT TRANSFORMER WITH TWO
SECONDARY WINDINGS ON THE CORE
NS-41 CORE BALANCE CURRENT
TRANSFORMER
06-02-02 OPEN VEE WINDING, V (60)
06-02-05 THREE-PHASE WINDING, DELTA
06-02-07 THREE-PHASE WINDING, STAR
06-02-08 THREE-PHASE WINDING, STAR,
WITH NEUTRAL BROUGHT OUT
ID. NO. ISSUE SHEET 13 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
08-02-08 SYNCHRONOSCOPE
08-02-14 TEMPERATURE
08-08-01 CLOCK
08-05-02 PULSE METER, COUNTING DEVICE
NEN-D-12 TERMINAL
03-03-06 PLUG AND SOCKET (MALE
AND FEMALE)
03-03-17 CONNECTING LINK, CLOSED
03-03-19 CONNECTING LINK, CLOSED
02-02-03 DIRECT CURRENT
02-02-04 ALTERNATING CURRENT
NEN-C-18 BUSDUCT
NEN-D-36A CABLE CONNECTION
NEN-D-39 CABLE GLAND
ID. NO. ISSUE SHEET 14 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-502.
NS-03 TURBINE T
NS-04 DIESEL D
06-04-01A (^) GENERATOR G
06-04-01B MOTOR M
06-04-01C MOTOR WITH WINDING
TEMPERATURE DETECTOR
M
02-17-06 CHARGER / CONVERTER
06-14-03 RECTIFIER
06-14-05 INVERTER
06-14-04 RECTIFIER IN FULL WAVE
(BRIDGE) CONNECTION
06-15-03A BATTERY OF ACCUMULATORS
OR PRIMARY CELLS
04-02-01A CAPACITOR
ID. NO. ISSUE SHEET 16 of 40
DOC.NO.
SYMBOL FOR KEY DIAGRAM, M.V.
AND L.V. ONE LINE DIAGRAMS
COMPANY DOCUMENT NS 501-
NS-09 ONE FUSE
NS-10 TWO FUSES
NS-11 THREE FUSES
NS-12 ONE VOLTMETER V
NS-13 TWO VOLTMETERS V
NS-14 THREE VOLTMETERS V
NOTE: SYMBOLS ONLY SHOWN FOR CLARIFICATION
ID. NO. ISSUE SHEET 17 of 40
DOC.NO.
SYMBOL FOR CONTROL AND
WIRING DIAGRAMS COMPANY
DOCUMENT NS 503
07-02-02 MAKE CONTACT / SWITCH
07-13-02 CONTACTOR (CONTACT OPEN IN
THE DEENERGIZED POSITION)
07-13-05 CIRCUIT BREAKER
07-13-06 DISCONNECTOR (ISOLATOR)
OFF LOAD
07-13-08 SWITCH-DISCONNECTOR
ON LOAD
07-21-08 FUSE-DISCONNECTOR
07-21-09 FUSE SWITCH-DISCONNECTOR
(ON-LOAD ISOLATING FUSE-SWITCH)
07-02-03 BREAK CONTACT
07-02-05 TWO-WAY CONTACT WITH
CENTRE-OFF POSITION
07-02-04 CHANGE-OVER CONTACT
ID. NO. ISSUE SHEET 19 of 40
DOC.NO.
SYMBOL FOR CONTROL AND
WIRING DIAGRAMS COMPANY
DOCUMENT NS 503
02-13-15 OPERATED BY ROLLER
02-13-16 OPERATED BY CAM
02-13-20 OPERATED BY SPRING
W
OPERATED BY PNEUMATIC
OR HYDRAULIC CONTROL,
SINGLE ACTING
OPERATED BY PNEUMATIC
OR HYDRAULIC CONTROL,
DOUBLE ACTING
02-13-23 OPERATED BY ELECTROMAGNETIC
ACTUATOR
02-13-26 OPERATED BY ELECTRICAL MOTOR
M
02-13-27 OPERATED BY ELECTRICAL CLOCK
02-14-01 CONTROL BY FLUID LEVEL
02-14-03 CONTROL BY FLOW
NEN-J-92 OPERATED BY PEDAL
NOTE: ONLY ACTION IS DESCRIPTED AND A SWITCH
IS SHOWN FOR CLARIFICATION.
SYMBOL CAN ALSO BE USED FOR CIRCUIT
BREACKERS, ISOLATORS A.S.O.
ID. NO. ISSUE SHEET 20 of 40
DOC.NO.